81843484 has 6 divisors (see below), whose sum is σ = 143226104. Its totient is φ = 40921740.

The previous prime is 81843473. The next prime is 81843529. The reversal of 81843484 is 48434818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10230432 + ... + 10230439.

Almost surely, 2^81843484 is an apocalyptic number.

It is an amenable number.

81843484 is a deficient number, since it is larger than the sum of its proper divisors (61382620).

81843484 is a wasteful number, since it uses less digits than its factorization.

81843484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20460875 (or 20460873 counting only the distinct ones).

The product of its digits is 98304, while the sum is 40.

The square root of 81843484 is about 9046.7388599428. The cubic root of 81843484 is about 434.1715575373.

The spelling of 81843484 in words is "eighty-one million, eight hundred forty-three thousand, four hundred eighty-four".